Implement a more dynamic UI

[hassek]

To have a more dynamic view of how the tasks are been processed it would be great to implement WebSockets into the UI.

Here is an official Django project for WebSockets but since the UI is done with node.js, it should be even easier to implement.

The idea is that everything will be automatically updated, including:

• Runs table inside the workflow
• Queue messages count
• Executions
• worker table
• Workflow table

[hassek]

@aclowes would like to be able to label as "enhancement" but I think I need permissions for labeling.